WILLIAMS AND 
KINDLE. 
FAUNULES OF GULF BROOK SECTION. 97 
Zone 5 of Gulf Brook section (1455 A). — Three and a half inches of 
beds above zone 4 are concealed. 
Zone 6 of Gulf Brook section (1455 A). — The 5 inches of soft olive 
shale of this zone afford the following species: 
Faunule of zone 6 of Gulf Brook section ( 1455 A ) . 
1. Lingula sp. (rare). 
2. Pholadella radiata (rare). 
3. Leptodesma spinigerum (abundant). 
The first of these species is extremely abundant, practically exclud- 
ing other forms. The three individuals of the third species are 
i smaller than specimens figured by Hall. Radiating stria? are absent 
from one of them. 
Zone 7 of Gulf Brook section (1455 A). — No fossils were collected 
| from this zone. 
Zone 8 of Gulf Brook section (1455 A). — This zone affords the fol- 
lowing faunule: 
Faunule of zone 8 of Gulf Brook section (1455 A). 
[a, abundant; r, rare.] 
1. Stropheodonta (Douvillina) mucro- 
nata (r). 
2. Delthyris mesicostalis (r). 
3. Amboccelia gregaria (a). 
4. Goniophora chemungensis (r). 
Zone 9 of Gulf Brook section (1455 A). — The 3 inches of shale 
immediately following the last zone contain the following species: 
1. Elymella sp. (rare). 
2. Sphenotus solenoides (common). 
3. Leptodesma spinigerum ( rare) . 
Zones 10 to 12 of Gulf Brook section (Uu55 A). — No fossils were 
obtained from these three zones. 
Zone 13 of Gulf Brook section (1455 A). — A 9-inch band of hard 
sandy limestone contains the following faunule: 
Faunule of zone 13 of Gulf Brook section (1455 A) . 
T a, abundant; c, common; r, rare.] 
1. Trematopora sp. (c). 
2. Chonetes setigerus (c). 
3. Delthyris mesicostalis (a) 
4. Amboccelia gregaria (a). 
5. Leptodesma spinigerum (r] 
6. Conularia sp. (r). 
D. mesicostalis has a well-developed median septum in the ventral 
valve. 
Zone 14 of Gulf Brook section (1455 A). — No fossils were collected 
from this zone. 
